71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
/* *****************************************************************************
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* libg1m/format/cas/gmem.h -- description of the CAS G-MEM format.
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libg1m.
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* libg1m is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libg1m is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libg1m; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************** */
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#ifndef LIBG1M_FORMAT_CAS_GMEM_H
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# define LIBG1M_FORMAT_CAS_GMEM_H
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# include <stdint.h>
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# pragma pack(1)
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/* You can save some graph function's expression inside a graph memory (G-MEM).
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* The data size is stored in CAS50's `length` field.
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* TODO: find out the equivalent with CAS40 headers?
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*
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* It starts with 20 graph entries, which have this format: */
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typedef struct g1m_cas_gmem_entry_s {
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/* function type code */
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uint8_t g1m_cas_gmem_entry_type;
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/* flags */
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uint8_t g1m_cas_gmem_entry_flags;
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} g1m_cas_gmem_entry_t;
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/* Where the function types are the following: */
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# define cas_gmem_type_ye 0x00 /* Y= */
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# define cas_gmem_type_re 0x40 /* r= */
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# define cas_gmem_type_yg 0x0C /* Y> */
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# define cas_gmem_type_yl 0x0D /* Y< */
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# define cas_gmem_type_yge 0x0E /* Y>= */
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# define cas_gmem_type_yle 0x0F /* Y<= */
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/* And the flags are the following: */
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# define cas_gmem_flag_orange 0x01
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# define cas_gmem_flag_blue 0x02
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# define cas_gmem_flag_green 0x04
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# define cas_gmem_flag_sel 0x80
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# define cas_gmem_flag_eqsel 0xB0
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/* If there are no flags (`entry.flags == 0`), then the function is not defined.
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* If the function type is one of: Y=, r=, Param (?)
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* Then use `cas_gmem_flag_eqsel` instead of `cas_gmem_flag_sel`.
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*
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* Then what we have after is the real content of the G-MEM (Y=DATA).
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* Each function's expression is separated from the others by a 0xFF character.
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* Casetta's documentation says the data is reversed, I don't know what they
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* mean (order? bitwise not?).
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*
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* There are 90 characters at the end of the content. It seems that they don't
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* change if you have one or more Y= function defined (independently of the
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* function expression).
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* TODO: find out what these are. */
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# pragma pack()
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#endif /* LIBG1M_FORMAT_CAS_GMEM_H */
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